# -*- coding: utf-8 -*-
from Queue import *

q = Queue() #队列
print q.empty()
q.put('hello')
print q.qsize()
q.put('world')
print q.get()
print q.qsize()
print q.

q2 = LifoQueue() #栈
q2.put('hello')
q2.put('world')
print q2.get()